Generate getters/setters for (/min/max)(width/height).

Currently, width, height, min-width, max-width, min-height, max-height
are generated as 'storage_only' fields, so they have no generated public
getters/setters. This patch changes them to 'external' fields so that
their getters/setters can be generated as well.

Diff of generated files:
https://gist.github.com/darrnshn/da85715450bd51e48cb1384a9ee9b1bb/revisions

BUG=628043

Review-Url: https://codereview.chromium.org/2846153002
Cr-Commit-Position: refs/heads/master@{#471661}
2 files changed